average

问题 I want to do an average : the problem is for 1 item i'm calculating the AVG of each elements ( working ) but as soon as i want the GLOBAL average of the averages of the categories (something and foo) it doesn't work (mysql throw me an error : see the syntax i used just below). I need to do that because i want to sort the result by the global average SELECT AVG(AVG(category1)+AVG(category2)) /2 as moy ..... ORDER BY moy DESC Thanks, edit : I would like to have the average of averages of each

问题 I want to do an average : the problem is for 1 item i'm calculating the AVG of each elements ( working ) but as soon as i want the GLOBAL average of the averages of the categories (something and foo) it doesn't work (mysql throw me an error : see the syntax i used just below). I need to do that because i want to sort the result by the global average SELECT AVG(AVG(category1)+AVG(category2)) /2 as moy ..... ORDER BY moy DESC Thanks, edit : I would like to have the average of averages of each

问题 Write a class called Average that can be used to calculate average of several integers. It should contain the following methods: A method that accepts two integer parameters and returns their average. A method that accepts three integer parameters and returns their average. A method that accepts two integer parameters that represent a range. Issue an error message and return zero if the second parameter is less than the first one. Otherwise, the method should return the average of the

问题 im trying to create an average on a rating. i have tried the AVG(column_name). however the problem with this is it does a total for all the ratings and gives the average. Select Company.company_id, company.Company_Name, avg(UserJobRating.Total_Rating) from company inner join UserJobRating on Job_id = UserJobRating.Job_ID inner join jobs on jobs.Company_id = company.company_id group by company.company_id what i want is say for example, a spefic company has 10/15 jobs each with a job rating. i

问题 I a having a little trouble with vector or array operations. I have three 3D arrays and i wanna find the average of them. How can i do that? we can't use mean() as it only returns a single value. The more important is some of the cells in the arrays are NA whic mean if i just add them like A = (B + C + D)/3 The results of will show NA as well. How can i let it recognise if the cell is NA then just skip it. Like A = c(NA, 10, 15, 15, NA) B = c(10, 15, NA, 22, NA) C = c(NA, NA, 20, 26, NA) I

问题 This question already has answers here : How do you split a list into evenly sized chunks? (62 answers) binning data in python with scipy/numpy (6 answers) Closed 2 years ago . I have a text file in which I have, for example, 1084 elements. I list them. import csv a = [] with open('example.txt', 'r') as csvfile: file_name = csv.reader(csvfile, delimiter='\t') for row in file_name: a.append(int(row[1])) print(a) [144, 67, 5, 23, 64...456, 78, 124] Next, I need to take the average of every one

问题 Let's say I have an array of 100 random numbers called random_array . I need to create an array that averages x numbers in random_array and stores them. So if I had x = 7 , then my code finds the average of the first 7 numbers and stores them in my new array, then next 7, then next 7... I currently have this but I'm wondering how I can vectorize it or use some python method: random_array = np.random.randint(100, size=(100, 1)) count = 0 total = 0 new_array = [] for item in random_array: if

问题 I am trying to average every n-th object of a specific column in a dataframe using the following code. I understand that using the for-loop is computationally inefficient. This is why I would like to ask whether there is a more efficient way to create the average of every n-th row? My data looks a little bit like this. set.seed(6218) n <- 8760 s1 <- sample(30000:70000, n) s2 <- sample(0:10000, n) inDf <- cbind(s1, s2) EDIT: I call h_average like this: h_average(inDf, 24, 1, 1) This would mean

问题 I have seen this - Horizontal line to show average in dygraph - and it doesn't quite answer my question. I have the following simple dygraph: g2 = new Dygraph( document.getElementById("graphdiv2"), "../newDataFile.csv", { ... } ); where newDataFile.csv has two columns. What I would like to show is the average of the points plotted (as a line or just a number), and for this average to change as I zoom in to different parts of the graph. Any ideas? 回答1: var idx=1; //change this value if you

问题 I have 3 very large tables, with values getting logged every minute, below is an extract of these tables. I would like to get hourly averages for a period of 1 Day of these tables and join them with respect to time, please note there is a couple of seconds gap between log time for ph and temperature Table PH (extract only, this table is very large with more than 130,000 values) ID time Ph 72176 2013-04-06 03:29:34 7.58 72177 2013-04-06 03:30:34 7.58 72178 2013-04-06 03:31:34 7.54 72179 2013